https://www.techradar.com/news/heres-more-evidence-the-samsung-gear-s4-will-have-a-big-battery

We don’t know a huge amount about the Samsung Gear S4 yet, but one thing that’s looking very likely is that it will have a bigger battery than the Samsung Gear S3 or Samsung Gear Sport, and today there’s more evidence for that, as Samsung is apparently planning to use a Panel level Packaging (PLP) manufacturing process.

That’s according to ET News, citing ‘industry sources’, and it’s a process that means the chip will take up less space on the motherboard, in turn leaving more space for other components.